Cooler



FIG. 1 is a top plan view of a cooler;

FIG. 2 is a front side elevational view thereof;

FIG. 3 is a rear side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a cooler, as shown and described. 